[v8] Provide proxy listener mode from reversetunnel.Resolver #17799
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By only providing the tunnel address from the `reversetunnel.Resolver` callers would still need to lookup the proxy listener mode to determine how to dial the address. This results in sending a request to `/webapi/find` once by the resolver to get the tunnel address and then a second request to `/webapi/find` by users of the `Resolver` to determine the proxy listener mode. Propagating the listener mode along with the tunnel address by the `Resolver` ensures only one `/webapi/find` call is needed. This is especially impactful because the `reversetunnel.TunnelAuthDialer` which is used by the auth http client would do this everytime the `http.Client` connection pool was empty. When the `http.Client` needed to dial the auth server it was incurring the additional roundtrip to the proxy.
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lxea
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zmb3
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Backports #16434 to branch/v8